Extend $stealth modifier

[ameshkov]

We should be able to disable certain stealth mode features, not all of them.

Examples:

• ||example.org^$stealth=cookie1p -- disables first-party cookies blocking for a given URL
• ||example.org^$stealth=cookie3p -- disables third-party cookies blocking for a given URL
• ||example.org^$stealth=referrer -- disables "hiding referrer"

[slavaleleka]

there are no exception rules for [Stealth Mode - first-party cookies], only for third-party cookies (~30 rules)

also there are such exceptions:

• IP hiding ~40 rules
• Block third-party Authorization header ~40 rules
• User-agent ~20 rules
• WebRTC ~20 rules

[sxgunchenko]

Here are the proposed options:

• 1p-cookie -- disables blocking first-party cookies
• 3p-cookie -- disables blocking third-party cookies
• 3p-cache -- enables cache for third-party requests
• xclientdata -- disables removing X-Client-Data header from HTTP requests
• donottrack -- disables sending Do-Not-Track signals
• ip -- disables hiding IP address
• 3p-auth -- disables blocking third-party Authorization header
• searchqueries -- disables hiding search queries
• referrer -- disables hiding referrer
• useragent -- disables hiding User-Agent
• webrtc -- disables blocking WebRTC
• push -- disables blocking Push API
• location -- disables blocking Location API
• flash -- disables blocking Flash
• java -- disables blocking Java
• dpi -- disables DPI fooling measures

The modifier can contain one or more options, the options are delimited by | character:

@@||example.com^$stealth=3p-cookie|dpi

[ameshkov]

Looks good